/* ===== 拼音拼读练习 /tool/pinyin-blend-drill ===== */

.detail-wrap {
    --pb-purple: #7c5cff;
    --pb-purple2: #a78bfa;
    --pb-blue: #3b82f6;
    --pb-sun: #fbbf24;
    --pb-sun2: #f59e0b;
    --pb-grad: linear-gradient(135deg, #7c5cff 0%, #a78bfa 100%);
    --pb-grad-warm: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
}

/* 头部 */
.pb-head { display: flex; gap: 22px; align-items: center; margin-bottom: 30px; }
.pb-head-icon {
    width: 74px; height: 74px; border-radius: 20px; display: grid; place-items: center;
    font-size: 38px; background: var(--pb-grad); color: #fff;
    box-shadow: 0 14px 30px rgba(124, 92, 255, .3);
}
.pb-head-main h1 { margin: 0 0 8px; font-size: 32px; font-weight: 900; letter-spacing: -.02em; color: var(--c-text); }
.pb-head-sub { margin: 0 0 14px; font-size: 15px; line-height: 1.7; color: var(--c-sub); max-width: 64ch; }
.pb-head-badges { display: flex; flex-wrap: wrap; gap: 8px; }

/* 主体 */
.pb-board { margin-bottom: 40px; }
.pb-mode-switch { display: flex; gap: 10px; margin-bottom: 16px; }
.pb-mode {
    flex: 1; padding: 13px; border: 1px solid var(--c-border); border-radius: 14px;
    background: var(--c-card); cursor: pointer; font-size: 15px; font-weight: 800; color: var(--c-sub); transition: .15s;
}
.pb-mode.active { background: var(--pb-grad); color: #fff; border-color: transparent; box-shadow: 0 10px 22px rgba(124, 92, 255, .28); }

.pb-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: 18px; padding: 22px; }
.pb-card-title { font-size: 16px; font-weight: 800; color: var(--c-text); margin-bottom: 18px; }

.pb-blend { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; padding: 10px 0 18px; }
.pb-syllable { min-width: 64px; padding: 16px 20px; border-radius: 16px; background: var(--c-bg); border: 1px solid var(--c-border); text-align: center; font-size: 34px; font-weight: 900; color: var(--c-text); }
.pb-syllable.pb-result { background: var(--pb-grad); color: #fff; border-color: transparent; box-shadow: 0 10px 22px rgba(124, 92, 255, .25); }
.pb-plus, .pb-arrow { font-size: 28px; font-weight: 900; color: var(--pb-purple); }

.pb-speak-row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 16px; }
.pb-speak-btn { padding: 11px 16px; border: 1px solid var(--c-border); border-radius: 12px; background: var(--c-bg); color: var(--c-text); font-size: 14px; font-weight: 700; cursor: pointer; transition: .15s; }
.pb-speak-btn:hover { border-color: var(--pb-purple); }
.pb-speak-main { background: var(--pb-grad); color: #fff; border-color: transparent; }

.pb-practice-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 14px; }
.pb-next { padding: 12px 22px; border: 0; border-radius: 12px; background: var(--pb-grad); color: #fff; font-size: 15px; font-weight: 800; cursor: pointer; box-shadow: 0 8px 18px rgba(124, 92, 255, .25); }
.pb-next:hover { filter: brightness(1.05); }
.pb-mark { padding: 12px 18px; border: 1px solid var(--c-border); border-radius: 12px; background: var(--c-bg); color: var(--c-text); font-size: 14px; font-weight: 700; cursor: pointer; }
.pb-rule { text-align: center; font-size: 13.5px; line-height: 1.8; color: var(--c-sub); background: var(--c-bg); border: 1px dashed var(--c-border); border-radius: 12px; padding: 12px 14px; }

.pb-score-row { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; color: var(--c-sub); margin-bottom: 14px; }
.pb-score-row b { color: var(--c-text); font-size: 16px; }
.pb-progress { margin-left: auto; color: var(--c-muted); }
.pb-listen { display: block; width: 100%; padding: 14px; border: 0; border-radius: 14px; background: var(--pb-grad); color: #fff; font-size: 16px; font-weight: 800; cursor: pointer; margin-bottom: 14px; box-shadow: 0 8px 18px rgba(124, 92, 255, .22); }
.pb-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.pb-opt { padding: 18px; border: 1px solid var(--c-border); border-radius: 14px; background: var(--c-bg); color: var(--c-text); font-size: 22px; font-weight: 900; cursor: pointer; transition: .12s; }
.pb-opt:hover:not(:disabled) { border-color: var(--pb-purple); transform: translateY(-1px); }
.pb-opt:disabled { cursor: default; }
.pb-opt.right { background: rgba(16, 185, 129, .18); border-color: #10b981; color: #059669; }
.pb-opt.wrong { background: rgba(239, 68, 68, .16); border-color: #ef4444; color: #dc2626; }
.pb-feedback { margin-top: 14px; text-align: center; font-size: 15px; font-weight: 700; color: var(--c-text); min-height: 22px; }
.pb-start { display: block; width: 100%; padding: 14px; border: 0; border-radius: 14px; background: var(--pb-grad-warm); color: #fff; font-size: 16px; font-weight: 800; cursor: pointer; margin-top: 6px; }

.pb-tip { margin-top: 16px; font-size: 13px; line-height: 1.8; color: var(--c-sub); background: var(--c-bg); border: 1px solid var(--c-border); border-left: 4px solid var(--pb-sun); border-radius: 12px; padding: 14px 16px; }
.pb-tip b { color: var(--c-text); }

/* AI */
.pb-ai { margin-top: 18px; border-top: 1px dashed var(--c-border); padding-top: 16px; }
.pb-ai-btn { padding: 12px 18px; border: 0; border-radius: 12px; cursor: pointer; background: var(--pb-grad-warm); color: #fff; font-size: 14px; font-weight: 800; box-shadow: 0 8px 20px rgba(245, 158, 11, .28); }
.pb-ai-btn:hover { filter: brightness(1.04); }
.pb-ai-status { margin-top: 10px; font-size: 13px; color: var(--c-sub); min-height: 18px; }
.pb-ai-result { margin-top: 12px; padding: 14px 16px; border-radius: 12px; background: var(--c-bg); border: 1px solid var(--c-border); font-size: 14px; line-height: 1.85; color: var(--c-sub); white-space: pre-wrap; }
.pb-ai-result b, .pb-ai-result strong { color: var(--c-text); }

/* tabs 内容 */
.pb-block-head { font-size: 19px; font-weight: 800; color: var(--c-text); margin: 0 0 16px; }
.pb-feature-chips { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 18px; margin-bottom: 26px; }
.pb-feature-chip { display: flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--c-sub); }
.pb-feature-chip .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--pb-purple); flex-shrink: 0; }
.pb-prose { font-size: 15px; line-height: 1.9; color: var(--c-sub); }
.pb-prose b { color: var(--c-text); }

.pb-steps { display: flex; flex-direction: column; gap: 12px; }
.pb-step { display: flex; gap: 14px; padding: 14px 16px; border-radius: 14px; background: var(--c-card); border: 1px solid var(--c-border); }
.pb-step-no { flex-shrink: 0; width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-weight: 800; color: #fff; background: var(--pb-grad); font-size: 14px; }
.pb-step-body { font-size: 14px; color: var(--c-sub); line-height: 1.7; }
.pb-step-body b { color: var(--c-text); }

.pb-faq { display: flex; flex-direction: column; gap: 10px; }
.pb-faq details { border: 1px solid var(--c-border); border-radius: 14px; background: var(--c-card); padding: 0 16px; }
.pb-faq summary { cursor: pointer; padding: 14px 0; font-weight: 700; font-size: 14.5px; color: var(--c-text); list-style: none; }
.pb-faq summary::-webkit-details-marker { display: none; }
.pb-faq summary::after { content: "+"; float: right; color: var(--pb-purple); font-size: 20px; line-height: 1; }
.pb-faq details[open] summary::after { content: "−"; }
.pb-faq .pb-faq-a { padding: 0 0 16px; font-size: 13.5px; line-height: 1.8; color: var(--c-sub); }
.pb-faq .pb-faq-a b { color: var(--c-text); }

/* 相关 */
.pb-related { margin-top: 42px; }
.pb-related h2 { font-size: 22px; font-weight: 800; color: var(--c-text); margin: 0 0 16px; }
.pb-rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.pb-rel-item { display: flex; align-items: center; gap: 14px; padding: 16px; border-radius: 16px; background: var(--c-card); border: 1px solid var(--c-border); text-decoration: none; transition: .18s; }
.pb-rel-item:hover { transform: translateY(-2px); border-color: var(--pb-purple); box-shadow: 0 10px 24px rgba(124, 92, 255, .12); }
.pb-rel-icon { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; font-size: 24px; background: var(--c-bg); flex-shrink: 0; }
.pb-rel-body { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.pb-rel-body b { font-size: 15px; font-weight: 700; color: var(--c-text); }
.pb-rel-body small { font-size: 12px; color: var(--c-muted); }
.pb-rel-go { margin-left: auto; color: var(--pb-purple); font-weight: 800; }

@media (max-width: 720px) {
    .pb-head { flex-direction: column; align-items: flex-start; }
    .pb-head-badges { justify-content: center; }
    .pb-feature-chips { grid-template-columns: 1fr; }
    .pb-options { grid-template-columns: 1fr; }
}